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Reduction of interference pickup in heads for magnetic recording by minimizing parasitic capacitance

a parasitic capacitance and interference pickup technology, applied in the field of magnetic storage devices, can solve problems such as adverse effects on error rate performance, and achieve the effect of reducing the capacitance of various head elements and reducing the high frequency interference pickup

Inactive Publication Date: 2009-08-11
IBM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014]An apparatus and method for reducing the high frequency interference pickup by the read element of the magneto-recording head are disclosed. In one embodiment, the objects of the invention are achieved by reducing the capacitance of various head elements.

Problems solved by technology

This has an adverse affect on the error rate performance.

Method used

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  • Reduction of interference pickup in heads for magnetic recording by minimizing parasitic capacitance
  • Reduction of interference pickup in heads for magnetic recording by minimizing parasitic capacitance
  • Reduction of interference pickup in heads for magnetic recording by minimizing parasitic capacitance

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second embodiment

[0039]the present invention is designed to reduce high frequency interference by increasing the separation between the contact pads 610 and the substrate material 614. One example of a manner of achieving a greater separation between the contact pads 610 and the substrate material 614 is to increase the thickness of the alumina undercoat 608. The layer of alumina undercoat 608 is deposited prior to the S1 layer 314 (seen in FIG. 3). A thickness of between about 20 to about 30 microns is preferably deposited, whereas prior art thicknesses have been about 3.5 μm to about 5 μm. The alumina undercoat 608 preferably comprises Al2O3, but may also comprise silicon oxide (SiO2).

[0040]The thick layer of the alumina undercoat 608 increases the distance between the contact pads 610 and substrate material 614, which leads to a reduction in high frequency interference picked up by the read elements 610.

third embodiment

[0041]the present invention comprises suspending the contact pads 610 on studs 604 as described previously, and using a material 602 having a low dielectric constant as a spacer layer between the contact pads 610 and the substrate 614. Under this embodiment, the need to increase the thickness of the alumina undercoat 608 may be eliminated. An increase in the thickness of the alumina undercoat 608 is less preferred, as it may introduce stress in the film and create a delimitation from the substrate material 614. The low dielectric material 602 preferably has a dielectric constant less then about 10 and a more preferably dielectric constant of about 3. An example of a low dielectric material 602 placed as a spacer between the contact pads 610 and the substrate 614 comprises silicon dioxide, which has a dielectric constant of about 3. FIG. 6 depicts a hard photoresist encapsulating the studs 604 and is used as a platform for the contact pads 610. The small area of the studs 604 leads t...

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Abstract

Disclosed is a system and a method for reducing high frequency interference pickup by the read element of the magneto-recording head. The reduction is achieved by reducing the parisitic capacitance between certain elements of the magnetic head. In one embodiment, the areas of the pads and leads, including the areas of the leads over the S1 and the areas of the sensor leads, are reduced. A second implementation involves increasing the separation between the pads and leads and the substrate material. Copper studs or vias may be used to connect the contact pads and the underlying layers. A third implementation includes using a low dielectric constant material as a spacer layer between conductors (leads, pads, magnetic shields) and the substrate.

Description

BACKGROUND OF THE INVENTION[0001]1. The Field of the Invention[0002]The invention relates generally to magnetic storage devices. More specifically, the present invention relates to disk drives where data is stored on and retrieved from magnetic media using a read / write head.[0003]2. The Relevant Art[0004]Computer systems generally utilize auxiliary memory storage devices having media on which data can be written and from which data can be read for later use. A direct access storage device, such as a disk drive, incorporating rotating magnetic disks is commonly used for storing data in magnetic form on the disk surfaces. Data is recorded on concentric, radially spaced tracks on the disk surfaces. Magnetic heads carrying read sensors are then used to read data from the tracks on the disk surfaces.[0005]In high capacity disk drives, magnetoresistive read sensors, commonly referred to as MR heads, are commonly used. This is largely due to the capability of MR heads of reading data on a ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G11B5/60G11B5/00G11B5/11G11B5/31G11B5/39
CPCB82Y10/00B82Y25/00G11B5/11G11B5/3903G11B2005/3996G11B5/3103G11B2005/0016G11B5/112
Inventor NIKITIN, VLADIMIRSALO, MICHAEL PAULYUAN, SAMUEL W.SMITH, ROBERT LANGLANDBURLESON, MARK ALLEN
Owner IBM CORP
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